Update network interfaces

[david-crespo]

Not sure what the UX is supposed to be like here, but we now have API support:

oxidecomputer/omicron#1186

[benjaminleonard]

Use the create network interface form as the basis for this – but I do need to document the differences in a pane for a create action versus update and delete.

[just-be-dev]

@benjaminleonard these options aren't available when editing. We've only got name, description, and primary (which is a boolean that only can be submitted if it's not already selected).

For primary I'm trying to figure out if that should be a checkbox or a radio. I think we need a hint or description or something to explain what's going on. (I'll explain better in the PR)

[bnaecker]

@zephraph If this is for updating more than one interface at a time, the widget would be a radio, since exactly one interface can be the primary. If it's for updating one interface, a checkbox makes more sense. I'd probably recommend disabling it (forcing it to checked) if the interface being edited is the primary. If the interface is a secondary, then a tooltip explaining what it does would be handy indeed.

[just-be-dev]

It's just for one at a time. I did end up showing it regardless and just having it disabled on the primary. I'll need @benjaminleonard's feedback from the design side just to figure out how to factor in the tooltip, etc.